/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.tomcat.util.modeler.modules;

import java.io.InputStream;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;

import org.apache.tomcat.util.digester.Digester;
import org.apache.tomcat.util.modeler.Registry;
import org.apache.juli.logging.Log;
import org.apache.juli.logging.LogFactory;

public class MbeansDescriptorsDigesterSource extends ModelerSource {
	private static Log log = LogFactory
			.getLog(MbeansDescriptorsDigesterSource.class);

	Registry registry;
	String location;
	String type;
	Object source;
	List mbeans = new ArrayList();
	protected static Digester digester = null;

	protected static Digester createDigester(Registry registry) {

		Digester digester = new Digester();
		digester.setNamespaceAware(false);
		digester.setValidating(false);
		URL url = Registry.getRegistry(null, null).getClass().getResource(
				"/org/apache/tomcat/util/modeler/mbeans-descriptors.dtd");
		digester
				.register(
						"-//Apache Software Foundation//DTD Model MBeans Configuration File",
						url.toString());

		// Configure the parsing rules
		digester.addObjectCreate("mbeans-descriptors/mbean",
				"org.apache.tomcat.util.modeler.ManagedBean");
		digester.addSetProperties("mbeans-descriptors/mbean");
		digester.addSetNext("mbeans-descriptors/mbean", "add",
				"java.lang.Object");

		digester.addObjectCreate("mbeans-descriptors/mbean/attribute",
				"org.apache.tomcat.util.modeler.AttributeInfo");
		digester.addSetProperties("mbeans-descriptors/mbean/attribute");
		digester.addSetNext("mbeans-descriptors/mbean/attribute",
				"addAttribute", "org.apache.tomcat.util.modeler.AttributeInfo");

		/*
		 * digester.addObjectCreate
		 * ("mbeans-descriptors/mbean/attribute/descriptor/field",
		 * "org.apache.tomcat.util.modeler.FieldInfo");
		 * digester.addSetProperties
		 * ("mbeans-descriptors/mbean/attribute/descriptor/field");
		 * digester.addSetNext
		 * ("mbeans-descriptors/mbean/attribute/descriptor/field", "addField",
		 * "org.apache.tomcat.util.modeler.FieldInfo");
		 * 
		 * digester.addObjectCreate ("mbeans-descriptors/mbean/constructor",
		 * "org.apache.tomcat.util.modeler.ConstructorInfo");
		 * digester.addSetProperties ("mbeans-descriptors/mbean/constructor");
		 * digester.addSetNext ("mbeans-descriptors/mbean/constructor",
		 * "addConstructor", "org.apache.tomcat.util.modeler.ConstructorInfo");
		 * 
		 * digester.addObjectCreate
		 * ("mbeans-descriptors/mbean/constructor/descriptor/field",
		 * "org.apache.tomcat.util.modeler.FieldInfo");
		 * digester.addSetProperties
		 * ("mbeans-descriptors/mbean/constructor/descriptor/field");
		 * digester.addSetNext
		 * ("mbeans-descriptors/mbean/constructor/descriptor/field", "addField",
		 * "org.apache.tomcat.util.modeler.FieldInfo");
		 * 
		 * digester.addObjectCreate
		 * ("mbeans-descriptors/mbean/constructor/parameter",
		 * "org.apache.tomcat.util.modeler.ParameterInfo");
		 * digester.addSetProperties
		 * ("mbeans-descriptors/mbean/constructor/parameter");
		 * digester.addSetNext
		 * ("mbeans-descriptors/mbean/constructor/parameter", "addParameter",
		 * "org.apache.tomcat.util.modeler.ParameterInfo");
		 * 
		 * digester.addObjectCreate
		 * ("mbeans-descriptors/mbean/descriptor/field",
		 * "org.apache.tomcat.util.modeler.FieldInfo");
		 * digester.addSetProperties
		 * ("mbeans-descriptors/mbean/descriptor/field"); digester.addSetNext
		 * ("mbeans-descriptors/mbean/descriptor/field", "addField",
		 * "org.apache.tomcat.util.modeler.FieldInfo");
		 */
		digester.addObjectCreate("mbeans-descriptors/mbean/notification",
				"org.apache.tomcat.util.modeler.NotificationInfo");
		digester.addSetProperties("mbeans-descriptors/mbean/notification");
		digester.addSetNext("mbeans-descriptors/mbean/notification",
				"addNotification",
				"org.apache.tomcat.util.modeler.NotificationInfo");

		digester.addObjectCreate(
				"mbeans-descriptors/mbean/notification/descriptor/field",
				"org.apache.tomcat.util.modeler.FieldInfo");
		digester
				.addSetProperties("mbeans-descriptors/mbean/notification/descriptor/field");
		digester.addSetNext(
				"mbeans-descriptors/mbean/notification/descriptor/field",
				"addField", "org.apache.tomcat.util.modeler.FieldInfo");

		digester.addCallMethod(
				"mbeans-descriptors/mbean/notification/notification-type",
				"addNotifType", 0);

		digester.addObjectCreate("mbeans-descriptors/mbean/operation",
				"org.apache.tomcat.util.modeler.OperationInfo");
		digester.addSetProperties("mbeans-descriptors/mbean/operation");
		digester.addSetNext("mbeans-descriptors/mbean/operation",
				"addOperation", "org.apache.tomcat.util.modeler.OperationInfo");

		digester.addObjectCreate(
				"mbeans-descriptors/mbean/operation/descriptor/field",
				"org.apache.tomcat.util.modeler.FieldInfo");
		digester
				.addSetProperties("mbeans-descriptors/mbean/operation/descriptor/field");
		digester.addSetNext(
				"mbeans-descriptors/mbean/operation/descriptor/field",
				"addField", "org.apache.tomcat.util.modeler.FieldInfo");

		digester.addObjectCreate(
				"mbeans-descriptors/mbean/operation/parameter",
				"org.apache.tomcat.util.modeler.ParameterInfo");
		digester
				.addSetProperties("mbeans-descriptors/mbean/operation/parameter");
		digester.addSetNext("mbeans-descriptors/mbean/operation/parameter",
				"addParameter", "org.apache.tomcat.util.modeler.ParameterInfo");

		return digester;

	}

	public void setRegistry(Registry reg) {
		this.registry = reg;
	}

	public void setLocation(String loc) {
		this.location = loc;
	}

	/**
	 * Used if a single component is loaded
	 * 
	 * @param type
	 */
	public void setType(String type) {
		this.type = type;
	}

	public void setSource(Object source) {
		this.source = source;
	}

	public List loadDescriptors(Registry registry, String location,
			String type, Object source) throws Exception {
		setRegistry(registry);
		setLocation(location);
		setType(type);
		setSource(source);
		execute();
		return mbeans;
	}

	public void execute() throws Exception {
		if (registry == null) {
			registry = Registry.getRegistry(null, null);
		}

		InputStream stream = (InputStream) source;

		if (digester == null) {
			digester = createDigester(registry);
		}

		synchronized (digester) {

			// Process the input file to configure our registry
			try {
				// Push our registry object onto the stack
				digester.push(mbeans);
				digester.parse(stream);
			} catch (Exception e) {
				log.error("Error digesting Registry data", e);
				throw e;
			} finally {
				digester.reset();
			}

		}

	}
}
